Wrong Vsync on Firefox
User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36
Steps to reproduce:
I've opened vsynctester.com on Linux Mint 20.3 XFCE and Linux Mint 20.3 MATE and Kubuntu 20.04 with Firefox and Google Chrome.
Actual results:
On Linux Mint 20.3 XFCE I've noticed red and cyan vsync indicator with Firefox. On Linux Mint 20.3 MATE and Kubuntu i've noticed grey vsync indicator.
However on Google Chrome I've noticed grey vsync indicator also on XFCE.
Expected results:
On Linux Mint 20.3 XFCE vsync indicator should be grey.
I've also reported this bug here. https://bugzilla.mozilla.org/show_bug.cgi?id=1775153